1. One more consideration is what you intend to farm. If you plan to farm Phul guns, wind kaiser will be very helpful.

2. I would do Shingen, Lugh, Tish, Mike AW, Sol AW. If you want to go full glass cannon MVP-racing, swap Sol out for light Tsuku even. I usually use Tish TA buff on Mike and Tish herself since that's where the burst bottleneck usually is. You should be hitting 3T burst cycle with that setup assuming you have tiara sets on Tish and Mike (actually, I don't even have Tish's slots unlocked yet and I can still hit 3T burst cycles with just Shingen/Tish/Mike/fluffy DATA buffs.) 2T burst is also possible when Shingen and/or Mike's BG gain skill is off CD. When Eros gets her AW, 1T bursts can happen, too if you hold both Shingen and Mike's BG gain - yes, literally back-to-back FB, no light Nike required.

Light Athena can be good but only off-element - her defenses are useless against DUlt and DRag. She is in theory useful against Aratron but it's pretty easy to out-heal Aratron, so I don't use her there either. I only use her in WiRag right now, and only if I manual. I used to use her with Joan against Hagith - that combo allows you to easily survive the trigger. I keep getting 3rd place with that setup though, so I don't use it anymore - I use a slightly more offensive team that actually has a chance at getting MVP or die trying.

Athena does come in handy occasionally when I need a defensive hime for GO or something. I also used her in the last dummy so I don't have to worry about stunning the dummy at the right time. She can also be used in an AAB build paired with Vishnu, but I would wait for her rebalance for that - around the end of the year, she should get fortitude at the beginning of battle and her endurance buff gets better (I forgot the exact details.)